Stop motion for twisting frame or the like



Dec. 22, 1964 F. T. GLASS 3,162,005

STOP MOTION FOR TWISTING FRAME OR THE LIKE Filed Aug. 21, 1965 1N VEN TOR.

Y Frea' T Glass B ATTORNEY United States Patent 3,162,005 STOP MOTIGN FOR TWESTING FRAME OR THE LIKE Fred T. Glass, Sanford, N.C., assignor to Roberts Company, Sanford, N.C., a corporation of North (Zaroiina Fiied Aug. 21, 1963, Ser. No. 393,485 6 Ciaims. (Cl. 57-84) This invention relates to twisting frames or the like and more particularly to a stop motion for application in combination with a pair of rolls of a textile twisting or a drawing frame.

It is a general objective of this invention to provide a textile twisting frame in which a yarn, sliver or roving stop motion device elevates a top roll eliminating yarn waste and downtime as well as excessive roll laps.

This invention, and other objectives sought, relates to arrangements and combinations of twisting, drawing or spinning frames which will be hereinafter described and more particularly pointed out in the appended claims, and a preferred form of the invention is shown in the drawing, in which:

FIG. 1 is a sectional elevational view of only a portion of a twisting frame embodying this invention during normal twisting operations;

FIG. 2 is a side elevational view of a portion of a twisting frame illustrating the apparatus after an end is down; and

FIG. 3 is an enlarged perspective view of a stop motion device embodying this invention.

Referring to FIGS. 1 and 2 of the drawing, there is illustrated only the front top and bottom rolls and 11, respectively, of a twisting frame 12, only a portion thereof being illustrated to present the concept of this invention, although it will be readily apparent to those skilled in the art that the applicability of this invention pertains to various types of twisting, spinning, roving or drafting frames provided, however, the front rolls are oriented substantially as shown and described. The bottom roll 11 is suitably cradled in the projecting arm 13 by bearings retained therein at spaced intervals along the frame of the apparatus. The upstanding arm 14 for supporting the top roll 10 in spaced vertical relation and rolling contact with the bottom roll 11 is provided with an open top bearing 15 at spaced intervals along the twisting frame for cooperatively receiving the shaft 16 of top roll 10 for rotation therein.

Depending upon the relative radius of each of the top and bottom rolls, the arm- 14 may be adjusted vertically depending upon the twisting desired in the yarn being processed. Guide inlet eyelet 17 is provided in advance of top roll 10 and fixedly mounted on the frame while the pigtail 18 is fixedly mounted beneath the bottom roll 11 on the frame and in spaced relationship to the bottom roll 11.

As this invention is particularly significant with but not restricted to the front top and bottom rolls, reference will be restricted to such rolls without regard to the other rolls and aprons customarily employed in twisting or spinning frames.

A stop motion member 20 is pivotally mounted on shaft 21 positioned below bottom roll 11 which shaft may extend for the length of the twisting frame. Stop motion device 20 is provided with a forwardly projecting body 22 and an upturned section 23 which consists of a pair of laterally spaced apart arms 24 formed by the bifurcation of the body portion 22 at the forward portion thereof. The angle or arcuate portion 25 may vary depending upon the specific location of the shaft 21 and the angle of presentation for the forward portion 23.

Between the arms 24 is the yarn guide groove 26 that is open at one end 27 for cooperatively receiving therein 3,lfi2,%5 Patented Dec. 22, 1964 the roving or yarn from the top and bottom rolls 10 and 11. The terminal portion 28 of the groove or recess 26 is suitably radiused or rounded and free of indentations or projections that may cause severance during yarn travel through and in contact with the edge 28. The forward portions of the arms 24 are each provided with a top ro-ll elevating cam 29 which may be in the form of an inclined plane with the foremost edges 30 being sufficiently sharp or fine to be introduced into the nip 31 formed between the top and botom rolls 10 and 11.

As will be appreciated, the body member 22 and forwardly projecting portion 23 of the stop motion device 21) may be molded of plastic so as to form a unitary structure having sufiicient flexibility and resilience, and preferably suiiiciently light in weight so as to be responsive immediately to severance of the yarn 37 and be introduced readily into the nip 31 between the rolls 10 and 11 thereby elevating the top roll 10 within its bearing 15, as shown more clearly in FIG. 2.

A counterbalancing weight 32 is secured to the other end 33 of the stop motion device 29 by means of the screws 34 that are threadably received in the weight 32. Compensating adjustment for the weight and positioning of the stop motion may be performed through the elongated slots 35 in the end portion 33 of the stop motion.

As shown in FIG. 3, the coun-terbalancing weight 32 may be in the form of two separate segments A and B through which the shaft-receiving opening 36 is formed. However, a single counterbalancing weight may be employed as readily provided proper distribution and control is maintained.

Obviously many modifications and variations may be made to the configuration of the yarn guide groove 26, the camming member 29 and the overall configuration of the stop motion 20 without departing from the purpose and spirit of this invention and such modifications are contemplated within the scope of the appended claims.

What is claimed is:

1. A stop motion for use in textile twisting frames or the like comprising a pair of front and bottom rolls in rolling contact relationship, said bottom roll being bearingly supported for rotation, said top roll being bearingly supported and elevatable during rotation, and L,-shaped yarn guide and stop motion device pivotally mounted in juxtaposition to said rolls, said stop motion device having a pair of laterally spaced arms forming a U-shaped yarn-receiving opening, each of said arms having -a top roll elevating cam thereon whereby upon yarn severance said yarn guide and stop motion device pivots to introduce said cams between said rolls elevating the top roll out of rolling contact relationship with the bottom roll.

2. A stop motion as claimed in claim 1, said yarn guide and stop motion device having a counterbalancing weight thereon.

3. A stop motion as claimed in claim 1, said yarn guide and stop motion having a substantially rectilinear body portion having a counterbalancing weight at one end thereof and an uplifted forward section at the other end thereof having a yarn guide and a top roll elevating means thereon.

4. A stop motion as claimed in claim 3, said yarn guide and stop motion device being made of plastic.

5. For use in textile twisting frames or the like having a pair of front and bottom rolls in rolling contact relationship, said bottom roll being bearingly supported and said top roll being bearingly supported and elevatable during rotation, an L-shaped stop motion device pivotally mounted in juxtaposition to the nip formed by said top and bottom rolls, said device having a U-shaped yarn-receiving opening with means on said stop motion device for guiding a continuous yarn out of engagement with said roll, and a cam on said stop motion device for elevating said top roll upon yarn severance.

6. For use in a textile twisting frame or the like having front top and bottom rolls in rolling contact, said rolls being hearingly supported with said top roll being raisable out of rolling contact with said bottom roll, an Lshaped counterbalanced stop motion device mounted in juxtaposition to said roll and having a pair .of laterally spaced arms forming a U-shaped yarn-zeceiv-ing opening for sensing yarn continuity passing through said rolls, and cam means on said stop motion device for raising said top roll upon yarn discontinuity.

g, References Cited by the Examiner UNITED STATES PATENTS 608,731 8/98 Tolman et al 57-84 2,034,483 3/36 Olson 57-84 FOREIGN PATENTS 1,002,681 11/51 France.

1,917 9/53 Great Britain.

MERVIN STEIN, Primary Examiner. 

1. A STOP MOTION FOR USE IN TEXTILE TWISTING FRAMES OR THE LIKE COMPRISING A PAIR OF FRONT AND BOTTOM ROLLS IN ROLLING CONTACT RELATIONSHIP, SAID BOTTOM ROLL BEING BEARINGLY SUPPORTED FOR ROTATION, SAID TOP ROLL BEING BEARINGLY SUPPORTED AND ELEVATABLE DURING ROTATION, AND L-SHAPED YARN GUIDE AND STOP MOTION DEVICE PIVOTALLY MOUNTED IN JUXTAPOSITION TO SAID ROLLS, SAID STOP MOTION DEVICE HAVING A PAIR OF LATERALLY SPACED ARMS FORMING 